HI BBay,
I have asked myself the same question and I found one possible way. I have successfully converted some wine to vinegar this way. Here is how I did it but I am not giving you any guarantees. Making vinegar this way was an experiment.
Aceto bacteria, vinegar making bacteria, live on grapevines. Another microorganism that live on grapevine is yeast. The vine is host to wine making and vinegar making microorganism... cool!
I collected some dried twigs from my vine in the fall. Cut and tied some small twigs together as if I was making a herb bouquet for soup. I transferred some wine in a large and wide bottle only half full. At this point you should closed the bottle and shake vigorously to the point of foaming up the wine. This will aerate the wine. Aceto bacteria require oxygen to work. Next, hang the twigs in the bottle so they steep in the wine for one day. Tie a piece of cheese cloth around the opening to keep air coming in but not bugs (I use an elastic that holds the cheese cloth around the mouth as well as the twine that hangs the twigs).
Next day, take out the twigs and shake the wine vigorously. Add the twigs again. cover with cheese cloth. Do this for one week.
After one week, add new wine, shake vigorously and cover with cheese cloth.
After a month of so, you should start smelling the sourness meaning your culture is active and ready to accept new wine. For then on, shake the wine before adding it to the culture (no need to shake the culture)
It worked! Since I don't use wine vinegar that much nor have alot of left over wine, I don not have a culture anymore. I was thinking of trying it again this fall just because I like to experiment.
Luc H.
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